This article describes the steps to import self-signed certificate created on SRX on Mac OS. 

Refer creation of self-signed-certificate  on SRX.

For importing this certificate in Chrome web-browser on Ubuntu OS, follow the steps below: 

Step1: Export the certificate from the SRX device in .pem format

root@SRX# run request security pki local-certificate export certificate-id SRXasCA filename /var/tmp/SRXasCA.pem

certificate exported successfully

Step2: Copy this file to the machine running Mac OS in ‘Keychain Access” under the “System” tab

You will see that this certificate has a red-cross marking it as Untrusted. 

Step3: Select this certificate then Select File > Get Info and expand the Trust section.

Change Secure Sockets Layer (SSL) value to Always Trust.

Close the dialogs and enter your password.

Now, this certificate will be trusted, and the red-cross should disappear.

This certificate will be successfully imported to the machine.